An eponym (from the Greek epi- "upon" + onoma "name") is a word formed from a person's name. The adjective eponymous is used to describe something named after someone. For example, Robinson Crusoe is an eponymous work named after the main character.

EPONYMS
Key: The word's language of origin appears directly below it, and to the right of that is an example sentence and an etymology, along with any related themes.

Her son is a brainiac when it comes to computers.
Video game companies employ armies of brainiacs to do the best graphic design work.
From Braniac, superintelligent villain in Superman. Brainiac first appeared in Action Comics #242 (July 1958). Eponyms | Likely Literary

The inclusion of a sapphic romantic subplot lent the play an unusual allure.
From the Greek lyric poetess Sappho, who lived on the isle of Lesbos c. 600 B.C. Eponyms | Little-known Synonyms for Well-known Words